<!--多图片上传组件-->
<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{hide: this.fileList.length >= this.limit}"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传大小不超过<b style="color: #f56c6c">{{ fileSize }}MB</b>格式为<b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      的文件,最多上传{{limit}}个
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import { getByFileId,getBytesByUrl, delFile } from "@/api/system/file";

export default {
  props: {
    /**
     * 上传的图片服务器地址
     */
    uploadImgUrl: {
      type: String,
      default: process.env.VUE_APP_BASE_API + "/file/upload",
    },
    /**
     * 已存在的图片地址，一般为fileId/url（多个逗号分隔）或文件信息数组
     */
    value: [String, Object, Array],
    /**
     * 图片数量限制
     */
    limit: {
      type: Number,
      default: 5,
    },
    /**
     * 大小限制(MB)
     */
    fileSize: {
      type: Number,
      default: 10,
    },
    /**
     * 允许上传的文件类型
     */
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    /**
     * 是否显示提示
     */
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      headers: {
        "Api-Admin-Token":  getToken(),
      },
      fileList: []
    };
  },
  watch: {
    value: {
      async handler(val) {
        if (val) {
          // 首先将值转为数组
          let list;
          if (Array.isArray(val)) {
            list = val;
          } else {
            if(this.containsHttp(val)){
              await getBytesByUrl(val).then(res => {
                list = res.data;
              })
            }else{
              await getByFileId(val).then(res => {
                list = res.data;
              })
            }
          }
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            item = { name: item.originalName, url: item.fileUrl, fileId: item.fileId };
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    containsHttp(str) {
      return str.includes('http://') || str.includes('https://');
    },
    /**
     * 上传前loading加载
     * @param file
     * @returns {boolean}
     */
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }
      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    /**
     * 文件个数超出
     */
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    /**
     * 上传成功回调
     * @param res
     * @param file
     */
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.data.originalName, url: res.data.fileUrl, fileId: res.data.fileId });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    /**
     * 删除图片
     * @param file
     */
    handleDelete(file) {
      const index = this.fileList.map(f => f.name).indexOf(file.name);
      if(index > -1) {
        let fileId = this.fileList[index].fileId;
        delFile(fileId);
        this.fileList.splice(index, 1);
        this.$emit("change", this.getFileIds(this.fileList),this.getFileUrls(this.fileList));
      }
    },
    /**
     * 上传失败
     * @param res
     */
    handleUploadError(res) {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    /**
     * 上传结束处理
     */
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("change", this.getFileIds(this.fileList),this.getFileUrls(this.fileList));
        this.$modal.closeLoading();
      }
    },
    /**
     * 预览图片
     * @param file
     */
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    /**
     * 数组转成字符串
     * @param list 数组
     * @param separator 分隔符
     * @returns {string|string}
     */
    getFileIds(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].fileId) {
          strs += list[i].fileId + separator;
        }
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
    /**
     * 数组转成字符串
     * @param list 数组
     * @param separator 分隔符
     * @returns {string|string}
     */
    getFileUrls(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url + separator;
        }
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    }
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep .hide .el-upload--picture-card {
    display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
    transition: all 0s;
}

::v-deep .el-list-enter, .el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>

